Color and pattern male

Head: silvery-white.

Neck, back, shoulders, wing-bows and saddle-hackle: silvery-white, each feather ending in an elongated sharply pointed glossy green-black spangle, proportional in size to the feather.

Tail: feathers both inside and outside silvery-white white with black spangles, proportional in size to the feather.

Wing-bars: silvery-white, each feather ending in a large, almost round, glossy green-black spangle, resulting in two distinct bars across the wing.

Wing-flights: white, each feather ending in a black spangle.

Breast: silvery-white, each feather ending in a large, almost round glossy green-black spangle, sized to create a uniform, sufficiently open pattern.

Thighs and belly: similar to the breast,but the feathering below is predominant black below.

Fluff: dark blue-gray with white tinge.

Down: blue-gray.

Serious faults

Yellow tint in the ornamental feathers. Clearly visible peppering in the tail. Few or insufficient spangles in the hackles. Insufficient spangles at the ends of the sickles or wing-bows. Partial or entire black tail coverts. Excessive heavy, excessive light or crescent-shaped spangles on the breast, thighs and belly. 

Faults

Serious faults to a lesser extent.

Color and pattern female

Head: silvery-white, with black markings.

Neck: silvery-white,each feather ending in a elongated glossy green-black spangle; front of the neck similar to the breast.

Back, shoulders, smaller wing-coverts and saddle: silvery-white, each feather ending in a large, almost round, glossy green-black spangle, proportional in size to the feather.

Tail: feathers both inside and outside silvery-white white with black spangles, proportional in size to the feather.

Wing-bars: silvery-white, each feather ending in a large, almost round, glossy green-black spangle, resulting in two distinct bars across the wing.

Wing-flights: silvery white, each feather ending in a black spangle.

Breast: silvery white, each feather ending in a large, almost round glossy green-black spangle, sized to create a uniform, sufficiently open pattern.

Thighs and belly: similar to the breast,but the feathering below is predominant black below.

Fluff: dark blue-grey with white tinge.

Down: blue-grey 

Serious faults

Too small, too large or horseshoe-shaped spangles. Visible tinge in the tail feathers. Lack of spangles on the throat.

Faults

Serious faults to a lesser extent.

Feather details from:  http://www.kippenencyclopedie.nl

Website from Johan Albada with more than

         5000 photos of chicken-breeds, chicken color varieties and feathers

Genetic code: https://kippenjungle.nl/Overzicht.htm

Website from Henk Meijers with all available information regarding chicken genetics including the world famous 

Chicken Color Calculator